3. bashful

She smiled bashfully.

She gave a bashful smile as he complimented her on her work.

As a result, a diver wearing a rebreather can swim almost silently and invisibly—handy if you’re photographing bashful fish or, you know, sneaking up on the enemy spy who’s trying to sabotage your submarine.

Since he's in show business he often goofs around in a showy way, but once in a while he has these bashful mannerisms that are really cute.